cros: Init SystemTrayDelegate earlier to break bluetooth init dependency

ash/common/system/tray/system_tray_delegate.h

Index: ash/common/system/tray/system_tray_delegate.h
diff --git a/ash/common/system/tray/system_tray_delegate.h b/ash/common/system/tray/system_tray_delegate.h
index ceffd19ab736e35d7ec7e594c3572acc22a60869..8dd54ded7d0d666380f0dbd7d8fd320cbb4466ec 100644
--- a/ash/common/system/tray/system_tray_delegate.h
+++ b/ash/common/system/tray/system_tray_delegate.h
@@ -36,7 +36,8 @@ class SystemTrayItem;
 using IMEInfoList = std::vector<IMEInfo>;
 using IMEPropertyInfoList = std::vector<IMEPropertyInfo>;
 
-// TODO(jamescook): Move to TrayBluetoothHelper. http://crbug.com/660043
+// TODO(jamescook): Convert TrayBlueooth to use device::BluetoothDevice and
+// delete this. http://crbug.com/660043
 struct ASH_EXPORT BluetoothDeviceInfo {
   BluetoothDeviceInfo();
   BluetoothDeviceInfo(const BluetoothDeviceInfo& other);